C# | Inverting all bit values in BitArray Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.Not method inverts all the bit values in the current BitArray, so that elements set to true are changed to false, and elements set to false are changed to true. Properties: The BitArray class is a collection class in which the capacity is always the same as the count. Elements are added to a BitArray by increasing the Length property. Elements are deleted by decreasing the Length property. Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based. Syntax: public System.Collections.BitArray Not (); Return Value: It returns the current instance with inverted bit values. Example: CSHARP // C# code to invert values in BitArray using System; using System.Collections; class GFG { // Driver code public static void Main() { // Creating a BitArray BitArray myBitArr1 = new BitArray(4); // Creating a BitArray BitArray myBitArr2 = new BitArray(4); // Initializing values in myBitArr1 myBitArr1[0] = false; myBitArr1[1] = false; myBitArr1[2] = true; myBitArr1[3] = true; // Initializing values in myBitArr2 myBitArr2[0] = false; myBitArr2[1] = true; myBitArr2[2] = false; myBitArr2[3] = true; // Function calling to print the values // of BitArray myBitArr1 Console.WriteLine("Values in BitArray myBitArr1 are : "); PrintValues(myBitArr1); // Function calling to print the values // of BitArray myBitArr2 Console.WriteLine("Values in BitArray myBitArr2 are : "); PrintValues(myBitArr2); // inverting values in BitArray myBitArr1 myBitArr1.Not(); // inverting values in BitArray myBitArr2 myBitArr2.Not(); // Function calling to print the inverted values // of BitArray myBitArr1 Console.WriteLine("Values in BitArray myBitArr1 are : "); PrintValues(myBitArr1); // Function calling to print the inverted values // of BitArray myBitArr2 Console.WriteLine("Values in BitArray myBitArr2 are : "); PrintValues(myBitArr2); } // Displaying the result public static void PrintValues(IEnumerable myList) { foreach(Object obj in myList) { Console.WriteLine(obj); } } } Output: Values in BitArray myBitArr1 are : False False True True Values in BitArray myBitArr2 are : False True False True Values in BitArray myBitArr1 are : True True False False Values in BitArray myBitArr2 are : True False True False Note: This method is an O(n) operation, where n is Count. Reference: https://learn.microsoft.com/en-us/dotnet/api/system.collections.bitarray.not?view=netframework-4.7.2 Create Quiz Comment S Sahil_Bansall Follow 0 Improve S Sahil_Bansall Follow 0 Improve Article Tags : C# CSharp-method CSharp-Collections-Namespace CSharp-Collections-BitArray Explore IntroductionC# Tutorial 2 min read Introduction to .NET Framework 6 min read C# .NET Framework (Basic Architecture and Component Stack) 6 min read C# Hello World 2 min read Common Language Runtime (CLR) in C# 4 min read FundamentalsC# Identifiers 2 min read Data Types in C# 6 min read C# Variables 4 min read C# Literals 5 min read Operators in C# 7 min read C# Keywords 5 min read Control StatementsC# Decision Making (if, if-else, if-else-if ladder, nested if, switch, nested switch) 5 min read C# Switch Statement 4 min read Loops in C# 4 min read C# Jump Statements (Break, Continue, Goto, Return and Throw) 4 min read OOP ConceptsClass and Objects in C# 4 min read Constructors in C# 5 min read C# Inheritance 3 min read Encapsulation in C# 2 min read C# Abstraction 4 min read MethodsMethods in C# 4 min read Method Overloading in C# 4 min read Method Parameters in C# 4 min read Method Overriding in C# 7 min read Anonymous Method in C# 2 min read ArraysArrays in C# 6 min read Jagged Arrays in C# 4 min read Array Class in C# 5 min read How to Sort an Array in C# | Array.Sort() Method Set - 1 8 min read How to find the rank of an array in C# 2 min read ArrayListArrayList in C# 6 min read ArrayList Class in C# 4 min read C# | Array vs ArrayList 2 min read StringStrings in C# 6 min read C# Verbatim String Literal - @ 5 min read C# String Class 9 min read C# StringBuilder 2 min read C# String vs StringBuilder 3 min read TupleC# Tuple 7 min read C# Tuple Class 3 min read C# ValueTuple 7 min read C# ValueTuple Struct 4 min read IndexersC# Indexers 5 min read C# Multidimensional Indexers 5 min read C# - Overloading of Indexers 3 min read Like